nodejs-java

NodeJS+Java sample app

The purpose of this sample app is to demonstrate basic use of the operator across multi-lingual microservice applications. It combines the NodeJS sample app with the Java sample service, where the NodeJS app periodically calls to the Java service.

Prerequisites

• OpenTelemetry Operator installed in your cluster
• Artifact Registry set up in your GCP project (see the main README.md)
• An OpenTelemetryCollector object already created in the current namespace, such as the sample collector-config.yaml from the main README
• An Instrumentation object already created in the current namespace, such as the sample instrumentation.yaml from the main README

Running

1. Build and push the Java sample app:

   pushd ../java
   make build
   popd
   

2. Build and push the NodeJS sample app:

   pushd ../nodejs
   make build
   make push
   popd
   

3. Update the manifests in this directory to point to your newly-pushed images:

   make sample-replace
   

4. Deploy the apps in your cluster:

   kubectl apply -f k8s/.
   

5. Run the following commands to patch the app CronJob and service Deployment for auto-instrumentation:

   kubectl patch deployment.apps/nodeshowcase-app -p '{"spec":{"template":{"metadata":{"annotations":{"instrumentation.opentelemetry.io/inject-nodejs": "true"}}}}}'
   kubectl patch deployment.apps/javashowcase-service -p '{"spec":{"template":{"metadata":{"annotations":{"instrumentation.opentelemetry.io/inject-java": "true"}}}}}'
   

   These commands will use the Instrumentation created as part of the Prerequisites.

View your Spans

To stream logs from the otel-collector, which will include spans from this sample application, run:

kubectl logs deployment/otel-collector -f

Alternatively, follow the cloud-trace recipe to view your spans in Google Cloud Trace.